An optical information recording method including: irradiating a recording medium with laser light, wherein 0 signals having width nT are recorded or rewritten using continuous laser light having a power level Pe, and 1 signals having width nT are recorded or rewritten using a light pulse train having a first pulse portion fp having power Pw and width xT (T: clock time), a multi-pulse portion mp in which a number (n−n′) of high level pulses each having power Pw′ and width yT, and, if (n−n′)>1, a low level pulse which has power Pb and width (1−y)T are applied, and an end pulse portion ep having power Pb′ and width zT, wherein n and n′ are a positive integer (n>n′), and wherein each of Pw and Pw′ is greater than Pe, Pe is greater than each of Pb and Pb′, and at least one of x, y and z is in a range as follows: 0.35≦x≦0.75, 0.30≦y≦0.55, 0.35≦z≦0.70.
Legal claims defining the scope of protection, as filed with the USPTO.
2. The optical information recording method according to claim 1 , wherein the at least one of concentric grooves and a spiral groove is wobbled in a radius direction of the optical information recording medium at a period of from 4.0 μm to 4.6 μm.
3. The optical information recording method according to claim 1 , further comprising reading information stored in the optical information recording medium to fix the at least one of x, y and z at a fixed value in the range thereof.
4. The optical information recording method according to claim 1 , wherein the 0 signal and 1 signal are recorded or rewritten while the power levels Pw, Pw′, Pe, Pb and Pb′ are controlled such that the recorded or rewritten signals have a jitter σ/T not greater than 9%, a modulation degree not less than 0.55 and a reflectance not less than 16% when the recorded or rewritten signals are reproduced.
6. The optical information recording apparatus according to claim 5 , wherein the at least one of concentric grooves and a spiral groove is wobbled in a radius direction of the optical information recording medium at a period of from 4.0 μm to 4.6 μm.
7. The optical information recording apparatus according to claim 5 , wherein the 1 signal is recorded or rewritten while the at least one of x, y and z is at a fixed value in the range thereof.
8. The optical information recording apparatus according to claim 5 , wherein the 0 signal and 1 signal are recorded or rewritten while the power levels Pw, Pw′, Pe, Pb and Pb′ are controlled such that the recorded or rewritten signals have a jitter σ/T not greater than 9%, a modulation degree not less than 0.55 and a reflectance not less than 16% when the recorded or rewritten signals are reproduced.
10. The optical information recording medium according to claim 9 , wherein the optical information recording medium stores information, and wherein the 1 signal is recorded or rewritten while the at least one of x, y and z is at a fixed value in the range thereof using the information.
11. The optical information recording medium according to claim 9 , wherein the at least one of concentric grooves and a spiral groove is wobbled in a radius direction of the optical information recording medium at a period of from 4.0 μm to 4.6 μm.
12. The optical information recording medium according to claim 9 , wherein the 0 signal and 1 signal are recorded or rewritten while the power levels Pw, Pw′, Pe, Pb and Pb′ are controlled such that the recorded or rewritten signals have a jitter σ/T not greater than 9%, a modulation degree not less than 0.55 and a reflectance not less than 16% when the recorded or rewritten signals are reproduced.
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April 4, 2002
July 5, 2005
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